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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c742ba9b9fabc5d8a41dee186dbd23dfe14d41f39a574ed47009688c00d7e0cd' 
  AND token = 'wRxp8Ql9trSo0gHqN5o7sTtHN4ab5FX8QOxY3m01MXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00188

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}